Although the large-capacity U disk, flash memory card is already the price of cabbage, but regain the U disk, flash memory card discarded at the corner of the table, after the repair is successful, make it into a USB boot disk or carry it with you To deal with the daily emergencies of copying small files, why not do it. Nowadays, mobile storage devices are closely related to our electronic life. Due to the mistaken insertion and removal of USB flash drives, file system errors when copying data, quality problems of viruses and disk viruses, etc., U disk cannot read data or cannot be accessed. It has become 0 bytes, always prompts formatting, or the capacity is getting smaller. Excluding hardware factors, in many cases we can use software tools to fix it ourselves. At first glance, don't take Windows improper cadres in the principle of gradual and orderly. Sometimes, the commands and programs that come with Windows may have some miraculous effects. The U disk and the flash card are not recognized. You can change the USB port to check whether the USB port is disabled in the BIOS setting, or re-identify after unmounting the USB mass storage device driver in the device manager. The drive letter is hidden and the drive letter can be reassigned via Windows Disk Management. If not, you can look at the [HKEY_CURRENT_USER/software/Microsoft/Windows/CurrentVersion/Ploicies/Explorer] branch in the registry to see if there is a “NoDrives” key, and if so, delete it, then log out and log back in. The removable storage device cannot be formatted. You can run the format command in DOS to try it out. Be good at using the error checking option under the Tools tab in the Removable Disk Properties dialog box of Windows, and also fix most file system errors. The author's friend's 40GB mobile hard disk, although it can store the read data normally, but every time you insert the computer, it always prompts formatting. After this method is repaired, the annoying dialog box will not pop up again. Small test knife U disk repair tool multi-pronged When Windows can not help you repair mobile storage devices, the following software can come in handy. Although the U disk (the same applies to various flash cards) can not be formatted, as long as it is not a bad injury, most of them have a solution. You may wish to try one by one. PortFree Production Program: First insert the USB flash drive into the USB interface, then enter the program and then click the option, then click the low grid, then select the capacity, exit, click & ldquo; run & rdquo;, then wait patiently ( figure 1). Universal USB flash drive repair tool (mformat): blue status-ready and write-ready should be displayed after running the program. Click the C button in front of this line to start formatting (Figure 2). Make boot disk tool (USBboot): If the first two methods can't identify or format the USB flash drive, use the boot disk to clear the partition table and rebuild it, and the USB flash drive can be revived. Run the program to select the U disk, format it with HDD, follow the prompts to unplug and then insert the USB flash drive, and finally complete the boot disk creation, and then format it under Windows (Figure 3). Universal low-grid tool (HA-LLFTOOL): This is a versatile low-grid tool. It was originally used for the repair of U disk mass production failure, but also supports low-level storage devices such as hard disk, mobile hard disk, memory card, U disk, etc. Turn. Select the drive letter corresponding to your USB flash drive in the software and click Next to select Format this hard drive in the Low Level Format tab. After the progress bar is finished, the low-level is completed. Finally, partition software such as DiskGenius is used to re-partition the U disk (Figure 4). More than enough to sacrifice U disk mass production Dafa If the above software is also no way for our mobile storage devices, only mass production tools can go out. It is not unfamiliar to make a USB-CDROM boot disk often, but for those who have not touched it, the software may be complicated to operate. If the parameter settings are improper, the USB flash drive may be damaged. But we are not trying to try it, and we are only trying to repair the U disk, the default parameters of the production tool are enough. The so-called mass production tool is a low-level software developed by the manufacturer for the U disk master chip. We can imagine it as a system for the U disk. The different hardware corresponds to different systems, so we have to use the ChipEasy chip. Worry software to see what is the main control chip of the U disk, so that you can download the corresponding production tools (Figure 5). Plug in the U disk to open the software. As you can see from the picture, the chip manufacturer: Maike Microchip model: MXT8208/MXT8209/MW8219. Compare this model with the model corresponding mass production tool from the USB flash drive website (the identification tool occasionally has an identification error, causing the mass production tool not to recognize the U disk, you can try the ChipGenius software to detect the chip model, if it is still not detected, this At that time, you can only open the USB flash drive and query the chip model from the main control chip. In addition, the different versions of the production tools and the different Windows operating systems may also cause the mass production tools to not recognize the USB flash drive. Then open the mass production tool, all use the software default settings, the mass production tool will automatically identify the U disk capacity, most of the cottage expansion disk will be exposed at this time, the capacity does not match the nominal. If you are still not sure, you can use the U disk expansion detection tool MyDiskTest to view the real capacity of the U disk (this software can not be used under Win 7 system, you can try the 360 security guard's own U disk authenticator to see if it is expanded). After the capacity is set properly, click “All Start” and the software will automatically scale (the rest of the chip model's mass production software operation is basically the same) (Figure 6). After such a long period of tossing, presumably most U disk can be completely renewed, if there is still a failure to copy large files or U disk display byte number is 0, it may be that the cottage expansion disk itself is too cut corners, the repair software has taken It can't do anything about it. The above mainly discusses the simple and practical repair method. The repair success is the main purpose, so the data in the mobile storage device can not be recovered. If there is precious data on the U disk, please ask the professional data recovery company for help. In addition, if there is a problem with the internal hardware of the USB flash drive and the flash memory card, although the computer can recognize it sometimes, the method in this article cannot do anything. All the software mentioned in this article can be downloaded and downloaded in the U disk home website. All software XP, Win 7 pro test available, some mass production tools will have some anti-virus software false positives. Knowledge extension: The above mentioned the flash memory type of the chip detection software ChipEasy chip worry-free: SLC refers to the technical method adopted by this USB flash chip. Commonly there are two types of MLC and TLC. SLC uses both positive and negative charges, and a floating gate stores 1 bit of information. It has a fast speed and long life, and is extremely expensive (about 3 times the price of MLC), and has a life of about 100,000 erases. MLC uses the charge of different potentials, a floating gate stores 2 bits of information, the speed is generally life expectancy, the price is average, about 10,000 erasing life, and occasionally there will be a batch of U disk or positioning high-end in a large factory. The U disk uses this technology. TLC uses the charge of different potentials, a floating gate stores 3 bits of information, the speed is slow and the life is short, the price is cheap, about 500-1000 erasing life, and most U disk in the market adopt this technology. This article comes from [System Home] www.xp85.com